Gearbox housing



FIG. 1 is a perspective view of a third embodiment of the gearbox housing of the new design;

FIG. 2 is an enlarged perspective view of the gearbox housing of FIG. 17;

FIG. 3 is a front view of the gearbox housing of FIG. 17;

FIG. 4 is a back view of the gearbox housing of FIG. 17;

FIG. 5 is a top view of the gearbox housing of FIG. 17;

FIG. 6 is a bottom view of the gearbox housing of FIG. 17;

FIG. 7 is a left side view of the gearbox housing of FIG. 17; and,

FIG. 8 is a right side view of the gearbox housing of FIG. 17.

The portions of the Figures shown in phantom lines are not part of the claimed design but are for illustration only. 

The ornamental design for a gearbox housing, as shown and described. 